#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>

int main()
{
  pid_t id = fork();
  if(id < 0)
  {
    perror("fork\n");
    return -1;
  }
  else if(id == 0)
  {
    //child proccess
    while(1)
    {
      printf("pid:%d ppid:%d\n",getpid(),getppid());
      sleep(1);
    }
  }
  else
  {
    //parent proccess
    
    while(1)
    {
      printf("pid:%d ppid:%d\n",getpid(),getppid());
      sleep(1);
    }
  }
  return 0;
}
